When creating Dynamic Item Page

I’m trying to select the field name “ID” so I can use the unique users ID to select their profile record for them to update and it’s part of the URL. I see ID at the end of the field list but it’s grayed out so I can’t select it.

I’m following these set of instructions:

Profile Page
Next, we create a page to display user profiles. It is a dynamic item page connected to the Members collection. Because we are creating a dynamic item page, we need to chose a field to add to the URL that uniquely identifies each member. Here we use the members’ automatically generated IDs to uniquely identify them. The URL looks like this::camera:

I’ve tried to manually enter ID when creating the Dynamic Item Page but I keep getting 404 URL not found errors. I have the permissions on the database collection set the following: Any ideas why I the Field ID “_ID” is grayed out or what I can do to fix this issue?

I’m trying to follow the instructions here Velo Tutorial: Building Your Own Members Area | Help Center | Wix.com

What is frustrating me is the fact that when I try to create a Dynamic Page from my “OfficialsData” Collection it doesn’t allow me to select field ID it shows it at the bottom but grayed out. Is it a permissions issue or something else?